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Biotite
Biotite

Sillimanite
Sillimanite



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Biotite
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Sillimanite

Biotite and Sillimanite Physical Properties

Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
Brittle
-
-
2.7-3.3
Uneven, Even
Perfect on the {001}
2.5-3.0
K(Mg,Fe++)3[AlSi3O10(OH,F)2
 
Tough
-
-
3.20-3.26
Splintery
{010} perfect
6-7.5
Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)

Biotite and Sillimanite Chemical Formula

While comparing Biotite and Sillimanite physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Biotite and Sillimanite chemical formula.

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Biotite and Sillimanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite Vs Sillimanite during the identification of gemstone. Specific gravity of Biotite is whereas that of Sillimanite is .